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Bare laser-synthesized Au-based nanoparticles as nondisturbing surface-enhanced Raman scattering probes for bacteria identification

Abstract : The ability of noble metal-based nanoparti-cles (NPs) (Au, Ag) to drastically enhance Raman scattering from molecules placed near metal surface, termed as surface-enhanced Raman scattering (SERS), is widely used for identification of trace amounts of biological materials in biomedical, food safety and security applications. However, conventional NPs synthesized by colloi-dal chemistry are typically contaminated by nonbiocompatible by-products (surfac-tants, anions), which can have negative impacts on many live objects under examination (cells, bacteria) and thus decrease the precision of bioidentification. In this article, we explore novel ultrapure laser-synthesized Au-based nanomaterials, including Au NPs and AuSi hybrid nanostructures, as mobile SERS probes in tasks of bacteria detection. We show that these Au-based nanomaterials can efficiently enhance Raman signals from model R6G molecules, while the enhancement factor depends on the content of Au in NP composition. Profiting from the observed enhancement and purity of laser-synthesized nanomaterials, we demonstrate successful identification of 2 types of bacteria (Listeria innocua and Escherichia coli). The obtained results promise less disturbing studies of biological systems based on good biocompatibility of contamination-free laser-synthesized nanomaterials. K E Y W O R D S bacteria detection, laser ablation in liquids, Raman spectroscopy, SERS, ultrapure laser-synthesized Au nanoparticles Martin Kögler and Yury V. Ryabchikov contributed equally to this study.
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Submitted on : Thursday, May 23, 2019 - 1:21:45 PM
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Martin Kögler, Yury Ryabchikov, Sanna Uusitalo, | Popov, Anton Popov, et al.. Bare laser-synthesized Au-based nanoparticles as nondisturbing surface-enhanced Raman scattering probes for bacteria identification. Journal of Biophotonics, Wiley, 2018, 11 (7), pp.e201700225. ⟨10.1002/jbio.201700225⟩. ⟨hal-02137908⟩

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